Set the excerpt characters at homepage

Hello,

I'd like to set the excerpt characters at homepage separate with excerpt characters at category page. So i asked my theme author about it, they told me i need to use this code to achive it (where the 30 is symbol count of the excerpt).

But we have one trouble here that when you try to add the custom excerpt to the post, it will be not affected by the code we added. The homepage still take all the characters of excerpt, not only limit 30 characters as we wish.

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